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While I dont know what the actual fuel consumption figures are, keep in mind the 4.8 has a much more advanced twin cam 24 valve cylinder head and I think also variable cam timing, so should be more efficient despite its extra capacity and power output. That said, use the power and you will pay for it at the bowser. I know of one person through the Nissan Patrol club who uses a 4.8 for touring and finds it economical enough that he has no plans to do an LPG conversion.